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Machining of hardened parts
Heiserová, Sofia ; Sliwková, Petra (referee) ; Polzer, Aleš (advisor)
The usage of quenched materials in industrial production leads to the application of hard machining. Higher requirements for machines and cutting tools are needed during hard machining than during conventional machining. Quenched materials carry problem of volume and geometric changes after quenching and after machining as well. It is necessary to think about volumetric compensation in advance, before quenching of the workpiece. An experiment is suggested for optimalisation of longitudinal turning of steels 42CrMo4 and 50CrMo4. Hard turning has notable benefits such as flexibility of cutting tools and elimination of coolants, which provides ecological benefits. However, the disadvantages are higher tool wear and high prices of tools.
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CNC turning of shaped stainless steel parts.
Vostřel, Jan ; Polzer, Aleš (referee) ; Píška, Miroslav (advisor)
This diploma thesis is focused on a CNC turning operation of form parts made of stainless steels. The first part of the diploma thesis is focused on a theoretical analysis of stainless steels material characteristics. The second part is focused on a concept of experiment of complex form experimental stainless steel components. In this thesis the new CNC technology is defined in a new operation system Sinumerik 840D/ShopTurn V06.04 with an application for a new multi-purpose turning centre SP280SY. The final part comprehends technical documentation, CNC programs of shaped components, their verification and overall photographic documentation.
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Application of measuring probes in a milling process with the MCV1210/Sinumerik 840D machine
Janovský, Petr ; Kalivoda, Milan (referee) ; Polzer, Aleš (advisor)
This thesis concerns the technological processes of machining of thin-walled parts and the modification of said processes in dependence on the following interopera-tive measurement of the real dimensions of these parts. Within the theoretical part a research study of technological possibilities of measuring thin-walled parts and principles of probe programming are presented. In the main practical part of the the-sis a proposal of an experiment is described, which tests the individual technologi-cal steps and their influence on the quality of a prototype of the produced thin-walled part. Numerical (NC) codes are created using parametric programming, which are then used during the realization of the experiment itself. In the conclusi-on there are presented and discussed the results of measuring of the machined surfaces and the influence of correction paths, which should help to achieve a mo-re accurate production according to given dimensions. This experiment, however, has not met the expected results. That is why new procedures have been designed in order to create said paths, which can be used in a future realization of this expe-riment.
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Possibilities for programming CNC lathe SP280SY.
Vondrák, Jan ; Kalivoda, Milan (referee) ; Polzer, Aleš (advisor)
Bachelors thesis is devoted on the shop oriented programming parts with numerical controlling system Sinumerik 840D. The first part includes analysis possibility shop oriented turning. Next part includes program of designed rotary part in ShopTurn with description used technology and graphic compare with programming in contours editor EMCO WinNC in system Sinumerik 840D and quantifier differences reach mechanical times at application instrumental equipment two producers. Final part includes technical documentation of designed rotary part and instrumental equipment.
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Sinumerik 840D tools for NC programming of machines
Hrabal, Josef ; Sámelová, Vendula (referee) ; Polzer, Aleš (advisor)
This thesis deals with the possibilities of SINUMERIK 840D applications on turning centers. The first part of the thesis is focused on methods of NC programming and especially on the description and operation of the control system through the tutorial SinuTrain 7.5 Ed. 2. The second part of thesis is generated NC programs on the selected components with parametric typing and using a counter. Production technology and the creation of the NC program is created for the CNC machine SP280SY. In conclusion, the thesis is done machining simulation machine with output times.
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Parametric programming in Fanuc control system
Hynčica, Vojtěch ; Kalivoda, Milan (referee) ; Polzer, Aleš (advisor)
The diploma thesis is focused on the use of parametric programming family of workpieces. The practical part includes the design of production technology and the creation of a parametric programs for the production of a given group of workpieces using a workpiece measuring probe. The use of common and system variables can be applied to the toolpath programming and the measurement of workpiece offsets, workpieces and machined areas by a workpiece probe and for measuring and checking tools using a tool probe. Measured values can be used in conditional programming to increase the level of automation of the manufacturing process.
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Production of grinding roller driveshaft
Vencl, Petr ; Osička, Karel (referee) ; Polzer, Aleš (advisor)
This master’s thesis deals with production of grinding roller driveshaft in Bühler CZ s.r.o. in Žamberk. In the first part the attention is focused on analysis of current technology. Following chapters of thesis are focused on innovations to existing production technology, for example a technological test, CNC programming realization, machine times calculations or creating of technical documentation to ensure production of rotating part. The last chapter of the thesis focuses on economical assessment.
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Analysis of tool steel cracking and a study of its elimination
Tomešek, Viktor ; Polzer, Aleš (referee) ; Píška, Miroslav (advisor)
The aim of this diploma thesis is to describe the causes and mechanisms of degradation processes that affect the surface of tools made of tool steel and to design and verify a practical solution that would lead to higher resistance of tools to these processes. Chapters in the theoretical part deal with fracture behavior of the material and the possibilities of its elimination, the experimental part includes testing of the effect of coating on the durability of hot forming tools.
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